EP0480929A1 - Verfahren zur herstellung von schaumglas. - Google Patents

Verfahren zur herstellung von schaumglas.

Info

Publication number
EP0480929A1
EP0480929A1 EP19900902663 EP90902663A EP0480929A1 EP 0480929 A1 EP0480929 A1 EP 0480929A1 EP 19900902663 EP19900902663 EP 19900902663 EP 90902663 A EP90902663 A EP 90902663A EP 0480929 A1 EP0480929 A1 EP 0480929A1
Authority
EP
European Patent Office
Prior art keywords
molten glass
glass composition
silicon carbide
slag
iron
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19900902663
Other languages
English (en)
French (fr)
Other versions
EP0480929B1 (de
Inventor
Keith Russel Mcneill
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vert Investments Ltd
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0480929A1 publication Critical patent/EP0480929A1/de
Application granted granted Critical
Publication of EP0480929B1 publication Critical patent/EP0480929B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C11/00—Multi-cellular glass ; Porous or hollow glass or glass particles
    • C03C11/007—Foam glass, e.g. obtained by incorporating a blowing agent and heating

Definitions

  • This invention relates to a method of manufacturing foam glass.
  • Foam glass having a bulk density of approximately 0.2 and a relatively high mechanical strength is known as a good inorganic insulating material.
  • the currently used methods of manufacturing foam glass employ activated carbon and produce a foam glass of an unattractive black appearance.
  • the foam glass product also tends to be expensive.
  • a method of manufacturing foam glass which includes, the step of contacting a molten glass composition which contains at least 0.2% by weight of FeO and sufficient sulphur to satisfy the Fe ++ ion, and which has a negative redox value of at least -7, with a carbide or nitride or oxynitride.
  • the preferred material for contacting the molten r I glass composition is silicon carbide. It is already well known that the presence of small errant pieces of silicon carbide left over from "dressing" of aluminous refractory blocks during construction of a glass melting furnace will cause bubble in glass produced in that furnace. The pieces of silicon carbide appear to have indefinite life and the production of glass is ruined by the bubble appearance with the result that furnaces have had to be shut down while the pieces of silicon carbide are removed.
  • the present invention is based on the realisation that this property of silicon carbide may be utilized with an appropriate molten glass composition to produce violent bubble and a foam glass.
  • the glass compositions used in the process of the present invention are glass compositions which will give amber colouration.
  • the amber colouration is produced by complex ions of iron oxide (FeO) and sulphur compounds, and it is thought that the process of the present invention proceeds as a result of the catalytic action of the carbide or oxynitride causing these complex ions to disintegrate with the sulphur ions taking up oxygen from the iron, and other metals more easily reduced than iron, thus releasing the metal, which is precipitated, and sulphur dioxide which is produced in large volume and foams the glass.
  • 0.37 o of S0 3 ion produces 5.4 cubic metres of gas per tonne of glass, each tonne of glass having a volume of 0.4 cubic metres.
  • the process of manufacturing foam glass in accordance with the present invention causes the precipitation of the iron or other metal
  • the process has application in the treatment of industrial s ⁇ gs, particularly steel slags in order to recover the metal, usually iron, which would otherwise be wasted.
  • the commercial emphasis may be on -the recovery of the metal with the formation of the foam glass as a useful by-product.
  • a method of recovering iron from a slag containing at least 107 o by weight of Fe 2 0 3 comprising the steps of adjusting the redox to a negative value of at least -7, adding sulphate to the slag, if necessary, to produce a vitreous slag having sufficient sulphur to satisfy the Fe ++ ion, contacting the vitreous
  • the process of the present invention may conveniently be carried out by dropping the molten glass composition or vitreous slag over a weir into a holding pot or crucible where it is stirred by a silicon carbide silicon nitride rod.
  • the foam glass is taken off by a platinum or other forehearth to machines where the foam glass may be moulded, blown, pressed, spun or simply dropped into water to provide a multiplicity of products.
  • the density of the final product can be varied depending on the mould size, the volume of foam and the depth to which a press is moved into the mould.
  • the molten glass composition or vitreous slag may be passed over a forehearth or down a spout made of silicon carbide, silicon nitride, silicon oxynitride, or other refractory carbide, nitride or oxynitride.
  • the present invention may be performed by sprinkling an appropriate carbide, nitride or oxynitride, preferably silicon carbide or silicon oxynitride, in powder form on the molten glass composition or vitreous slag in the furnace. Foam glass will then be obtained as the output from the furnace.
  • an appropriate carbide, nitride or oxynitride preferably silicon carbide or silicon oxynitride
  • fly ash contained sulphate and carbon and gave an 87, loss on ignition.
  • the quantities of sulphate and carbon present were therefore such as to produce a high negative redox in the dark amber glass.
  • Foam glass products obtained by methods in accordance with the present invention may be used as building blocks for heat, sound or fire protection, for insulation purposes at high or low temperature, or as a refractory material.
  • the raw materials used are waste matter from industrial processes which are cheap, and the present invention therefore provides foam glass at a low price compared with the foam glass currently available.
  • the foam glass is white or colourless and has a more pleasing appearance than the foam glass which is currently available.
EP90902663A 1989-02-10 1990-02-02 Verfahren zur herstellung von schaumglas Expired - Lifetime EP0480929B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB8903041 1989-02-10
GB8903041A GB2228000B (en) 1989-02-10 1989-02-10 Manufacture of foam glass
PCT/GB1990/000145 WO1990009355A1 (en) 1989-02-10 1990-02-02 Manufacture of foam glass

Publications (2)

Publication Number Publication Date
EP0480929A1 true EP0480929A1 (de) 1992-04-22
EP0480929B1 EP0480929B1 (de) 1995-04-19

Family

ID=10651487

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90902663A Expired - Lifetime EP0480929B1 (de) 1989-02-10 1990-02-02 Verfahren zur herstellung von schaumglas

Country Status (7)

Country Link
EP (1) EP0480929B1 (de)
AT (1) ATE121377T1 (de)
DE (1) DE69018825T2 (de)
DK (1) DK0480929T3 (de)
ES (1) ES2071091T3 (de)
GB (1) GB2228000B (de)
WO (1) WO1990009355A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9376344B2 (en) 2006-02-17 2016-06-28 Earthstone International, Llc Foamed glass ceramic composite materials and a method for producing the same
US9382671B2 (en) 2006-02-17 2016-07-05 Andrew Ungerleider Foamed glass composite material and a method for using the same
US10435177B2 (en) 2006-02-17 2019-10-08 Earthstone International Llc Foamed glass composite arrestor beds having predetermined failure modes
CN101602574B (zh) * 2009-07-14 2011-05-18 陕西科技大学 一种高强度泡沫玻璃的制备方法
RU2528798C1 (ru) * 2013-04-26 2014-09-20 федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Южно-Российский государственный технический университет (Новочеркасский политехнический институт)" Гранулированное пеношлакостекло
JP2017536281A (ja) 2014-06-11 2017-12-07 アースストーン インターナショナル リミテッド ライアビリティ カンパニー 発泡ガラス複合材料及びその使用方法
AT518807B1 (de) * 2016-06-21 2018-07-15 Rainer Kurbos Dr Diskoschaum
US11319235B2 (en) 2019-10-01 2022-05-03 Owens-Brockway Glass Container Inc. Glass manufacturing process

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126274A (en) * 1964-03-24 Process for reduction smelting of
CA965929A (en) * 1971-04-26 1975-04-15 The Carborundum Company Cellular fused silica and production thereof
SE364699B (de) * 1972-07-13 1974-03-04 Cementa Ab
EP0242872A1 (de) * 1986-04-23 1987-10-28 Helmut Dipl.-Ing. Pieper Verfahren zum Aufschäumen von glasbildenden mineralischen Stoffen, insbesondere Flugaschen etc., sowie Ofen zur Durchführung dieses Verfahrens

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9009355A1 *

Also Published As

Publication number Publication date
DE69018825T2 (de) 1995-08-17
GB8903041D0 (en) 1989-03-30
GB2228000A (en) 1990-08-15
ATE121377T1 (de) 1995-05-15
EP0480929B1 (de) 1995-04-19
DE69018825D1 (de) 1995-05-24
WO1990009355A1 (en) 1990-08-23
GB2228000B (en) 1992-09-23
ES2071091T3 (es) 1995-06-16
DK0480929T3 (da) 1995-06-26

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